CVE-2025-40150 (GCVE-0-2025-40150)

Vulnerability from cvelistv5 – Published: 2025-11-12 10:23 – Updated: 2026-05-23 16:01
VLAI
Title
f2fs: fix to avoid migrating empty section
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid migrating empty section It reports a bug from device w/ zufs: F2FS-fs (dm-64): Inconsistent segment (173822) type [1, 0] in SSA and SIT F2FS-fs (dm-64): Stopped filesystem due to reason: 4 Thread A Thread B - f2fs_expand_inode_data - f2fs_allocate_pinning_section - f2fs_gc_range - do_garbage_collect w/ segno #x - writepage - f2fs_allocate_data_block - new_curseg - allocate segno #x The root cause is: fallocate on pinning file may race w/ block allocation as above, result in do_garbage_collect() from fallocate() may migrate segment which is just allocated by a log, the log will update segment type in its in-memory structure, however GC will get segment type from on-disk SSA block, once segment type changes by log, we can detect such inconsistency, then shutdown filesystem. In this case, on-disk SSA shows type of segno #173822 is 1 (SUM_TYPE_NODE), however segno #173822 was just allocated as data type segment, so in-memory SIT shows type of segno #173822 is 0 (SUM_TYPE_DATA). Change as below to fix this issue: - check whether current section is empty before gc - add sanity checks on do_garbage_collect() to avoid any race case, result in migrating segment used by log. - btw, it fixes misc issue in printed logs: "SSA and SIT" -> "SIT and SSA".
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 40d76c393cca83938b11eb7ca8983aa3cd0ed69b , < db489778e6f2a4034c2cd26fadda2796eba24dcd (git)
Affected: 9703d69d9d153bb230711d0d577454552aeb13d4 , < 25d2dc669f2a7e48b335d1cb07139f2ffc9fe5df (git)
Affected: 9703d69d9d153bb230711d0d577454552aeb13d4 , < eec1589be36fcf7440755703e4faeee2c01e360b (git)
Affected: 9703d69d9d153bb230711d0d577454552aeb13d4 , < d625a2b08c089397d3a03bff13fa8645e4ec7a01 (git)
Affected: 6.6.33 , < 6.6.130 (semver)
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Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
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          "product": "Linux",
          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid migrating empty section\n\nIt reports a bug from device w/ zufs:\n\nF2FS-fs (dm-64): Inconsistent segment (173822) type [1, 0] in SSA and SIT\nF2FS-fs (dm-64): Stopped filesystem due to reason: 4\n\nThread A\t\t\t\tThread B\n- f2fs_expand_inode_data\n - f2fs_allocate_pinning_section\n  - f2fs_gc_range\n   - do_garbage_collect w/ segno #x\n\t\t\t\t\t- writepage\n\t\t\t\t\t - f2fs_allocate_data_block\n\t\t\t\t\t  - new_curseg\n\t\t\t\t\t   - allocate segno #x\n\nThe root cause is: fallocate on pinning file may race w/ block allocation\nas above, result in do_garbage_collect() from fallocate() may migrate\nsegment which is just allocated by a log, the log will update segment type\nin its in-memory structure, however GC will get segment type from on-disk\nSSA block, once segment type changes by log, we can detect such\ninconsistency, then shutdown filesystem.\n\nIn this case, on-disk SSA shows type of segno #173822 is 1 (SUM_TYPE_NODE),\nhowever segno #173822 was just allocated as data type segment, so in-memory\nSIT shows type of segno #173822 is 0 (SUM_TYPE_DATA).\n\nChange as below to fix this issue:\n- check whether current section is empty before gc\n- add sanity checks on do_garbage_collect() to avoid any race case, result\nin migrating segment used by log.\n- btw, it fixes misc issue in printed logs: \"SSA and SIT\" -\u003e \"SIT and SSA\"."
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/eec1589be36fcf7440755703e4faeee2c01e360b"
        },
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          "url": "https://git.kernel.org/stable/c/d625a2b08c089397d3a03bff13fa8645e4ec7a01"
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    "cveId": "CVE-2025-40150",
    "datePublished": "2025-11-12T10:23:27.399Z",
    "dateReserved": "2025-04-16T07:20:57.175Z",
    "dateUpdated": "2026-05-23T16:01:31.919Z",
    "state": "PUBLISHED"
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid migrating empty section\n\nIt reports a bug from device w/ zufs:\n\nF2FS-fs (dm-64): Inconsistent segment (173822) type [1, 0] in SSA and SIT\nF2FS-fs (dm-64): Stopped filesystem due to reason: 4\n\nThread A\t\t\t\tThread B\n- f2fs_expand_inode_data\n - f2fs_allocate_pinning_section\n  - f2fs_gc_range\n   - do_garbage_collect w/ segno #x\n\t\t\t\t\t- writepage\n\t\t\t\t\t - f2fs_allocate_data_block\n\t\t\t\t\t  - new_curseg\n\t\t\t\t\t   - allocate segno #x\n\nThe root cause is: fallocate on pinning file may race w/ block allocation\nas above, result in do_garbage_collect() from fallocate() may migrate\nsegment which is just allocated by a log, the log will update segment type\nin its in-memory structure, however GC will get segment type from on-disk\nSSA block, once segment type changes by log, we can detect such\ninconsistency, then shutdown filesystem.\n\nIn this case, on-disk SSA shows type of segno #173822 is 1 (SUM_TYPE_NODE),\nhowever segno #173822 was just allocated as data type segment, so in-memory\nSIT shows type of segno #173822 is 0 (SUM_TYPE_DATA).\n\nChange as below to fix this issue:\n- check whether current section is empty before gc\n- add sanity checks on do_garbage_collect() to avoid any race case, result\nin migrating segment used by log.\n- btw, it fixes misc issue in printed logs: \"SSA and SIT\" -\u003e \"SIT and SSA\"."
          }
        ],
        "id": "CVE-2025-40150",
        "lastModified": "2026-06-17T09:21:21.963",
        "metrics": {},
        "published": "2025-11-12T11:15:44.923",
        "references": [
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
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      "current_release_date": "2026-06-30T10:34:21+00:00",
      "cve": "CVE-2025-40150",
      "id": "CVE-2025-40150",
      "initial_release_date": "2025-11-12T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: f2fs: fix to avoid migrating empty section",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40150.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T01:48:45Z",
      "cve": "CVE-2025-40150",
      "id": "CVE-2025-40150",
      "initial_release_date": "2025-11-14T00:24:54Z",
      "product_status:known_not_affected": "515",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40150",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40150.json",
      "version": "8"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.